Idler pulley drive particularly for ring spinning and doubling frames



Dec. '17, 1929. J. HILDEBRANDT 1,739,550

IDLER PULLEY DRIVE PAHTICULARLY FOR RING SISINNING AND DOUBLING FRMESVFiled Nov. 2o, 192e Patented Dec. 17, 1929 UNITED y STATES vlairlalvrOFFICE MASCHINENFABRIK OERLIKON, OF OERLIKON,

CORPORATION OF SWITZERLAND NEAR ZURICH,v SXVITZERLAND, A

IDLER PULLEY DRIVE PARTICULAR-LY FOR RING SPINNING AND DOUBLING FRAMESApplication filed November 20, 1928, Serial No. 820,559, and in GermanyNovember 28,v 1927.

weight is allowed to tall, with the result that the idler pulley strikesthe belt violently and causes an abrupt connection to the drivingrpulley. In ring spinningand doublingframes, many breakages of threadarise trom this cause and with an electro-motor drive fuses are blown.

The present invention aims at avoiding this drawback as will behereinafter described.

` can be variedby means of a nut 30 on the stud 1.

The belt tensioning device operates in the` without selil locking drivessuch as worm drives or the like having to be employed.

In order more clearly to understand the invention, reference is made tothe accompanying drawings which illustrate one embodiment thereof and inwhich Fig. 1 is a side elevation;

Fig. 2 a plan View partly in section, andv Figs. 3 and 4 show details indiilerent operative positions. y y.

In the emboniment illustrated, 1 and 2 indicate two parallel fixedstuds. Pivotally mounted on the stud '1, is a belt tensioning idlerpulley 3 which is connected to a weight 6 by means ot a chain 4 led overa sprocket wheel 5. 7 indicates the belt, and 8 the driving pulley. A.ratchet wheel 9 is fast with the sprocket wheel 5 and the pawl 10belonging thereto is pivotally mounted on a stud 11 mounted on a leverarm 12. Moreover between the latter and the ratchet wheel 9 is a disc 13(Fig. 2) provided with two abutments 14 and 15, (Figs. 3 and 4) mountedloosely on the stud 2. Rotation of the abutment disc 13 relatively tothe lever arm 12 is limited by a pin 16 (Figs 3) on the lever arm 12projecting into a slot 17 in the abutment disc 13. The members 5, 9, 12and 13 are loosely mounted on the stud 2. In the path `of the abutment14 there project-s a tail 18 of the pawl 10. T his latter is caused bythe presence of a spring 19 (Fig. 1) to engage with a ratchet wheel 9,.(Fig. 3) but is lifted oil'1 the ratchet wheel 9when. the abutment 14encounters the tail 18 of the pawl (Fig. 4);

, Pivotally mounted on the stud 1 is a bell crank lever 2O provided witha handle 21 and a ratchet wheel 22, the pawl 23 of which is vcarried bya stud 24 on the shorter arm ot the bell crank lever 20 and is pressedby a spring (Fig. 1) into engagement with the teeth of the ratchetwheel. The stud 24 is connected arrod 26 with the stud of the pawl 10.The

lever 2O is located between a collar 27 and the ratchet wheel 22 againstwhich in turn bears a leather washer 29 under the pressure of a springwasher 28. This latter is mounted on a bush 32 which is axiallydisplaceable but not rotatable-on the stud 1. The pressure of theleather washer 29 against the ratchet wheel 22 tollowingmannerz-e In theposition of the parts illustrated in F igs, 1,2 and 4, the belt Tistight and is fully loaded by the weight 6. rThe-sprocket wheel 5 Vthenserves solely as a guide member for the oh ain4, the pawl 10 beinglifted by the disc 13, the' abutment 15 ot which has been forced back byan abutment 31 on the rod 26. It new the belt 7 is to befreleased inorderto set the driven machine out of operation, the weight 6 must belifted. This is e'dected by pressing down the lever 2O in the directionof the arrow indicated in Fig. 1. In such case, the following occursz-The pawl 23 runs over the teeth of the ratchet wheel 22, since theratchet wheel 22 does not participate in the movement of the lever 20,owing to the friction between these two parts being less than Athatbetween'tlie ratchet wheel 22 andthe leather washer 29.A The rod 26moves towards the left and is at the same time lifted so that theabutment 15 is released (Fig. 3) and the spring 19 presses the pawl 104to engagethe ratchet wheel 9. As the lever Varm '-12 is displaced-Withthe. rod 726,-the ratchet wheel 9 is also rotated counterclockwise and'thus the weight 6 is lifted.

f The reapplication of the loading on to the idler pulley 3, that is tosay the putting of the `pulley 8 into operation again is effected bylifting the hand lever in the opposite direction to that before. vdisplaced towards the right and is at ,the same time pushed downwardlyagainst the abutment 15, lwhereby the abutment disc 14 is displaced atthe end of the return movement andthe pawl 10 is lifted off the ratchetWheel v9 (Fig. 4). The sprocket wlieel 5 now again becomes merely aguide roller vfor the chain et and the weight 6 comes into fulloperation. The interposed leather washer Q9 prevents an labrupttensioning of the belt 7 by the weight 6 should the `handle 21 beprematurely released, provided the braking action of this leather washeris adjusted correspondingly to the weight 6 and the other movable parts.

It should be remarked that the hand lever 2O may be held fast in its twoend positions by mean-s of detent devices not shown.

The hereinbefore described belt tension- Y ingV drive is suitable foruse for the drives of ringspinningand doubling-frames.

If the above described arrangement is intended to be appli-ed to two ormulti-stepped pulley drives wherein the vbelt is displaced rom one tothe other stepped, the members carried on thefstudsll and 2 are mountedThe rod 26 is then 1 on sleeves which' are displaceably but not rotatably arranged onthe studs and' 2.

l. In an idler pulley belt drive, a pulley,

'a belt enwrapping saidl pulley, an idler pulley contacting with saidbelt, a loadv applied to said idler pulley, means for releasing andapplyingV said load to said idler pulley, a handlever connected to saidload-applying means, and abrake automatically applied to said AhandleverVwhen applying said load.

, plying said load.

2. vIn--an idler pulley belt drive', a pulley, a

belt enwrapping said pulley, an idler p ulley contacting with saidbelt,'a load applied'to said idler pulley, means including one-Wayclutches for releasing and applying said load to said idler pulley, ahandlever connected to saidv load-applying means, and a brakeautomatically applied to said handleve'r When ap- 3. In' an idler'pulley belt drive, a pulley, a belt enwrapping said pulley, an idlerpulley contacting withsaid belt, a weight", a chain interconnecting saidweight and idler pulley, a sprocket Wheel enwrapped by said chain, a

' ratchet wheel fast with said sprocket wheel,

aflev'er arm vadjacent said ratchet Wheel, a

pawl on said lever arm engaging said ratchet' Wheel, an'abutment disc,an abutment of said disc contacting with saidp'awl, `I'neans permittingbut limited angular movement 'of said `disc relatively to said ratchetwheel, a

connected to said lever am, a second i lio

